Decay time PDF with time dependent resolution parameters

Dear experts,
I’d like to ask you if there is any method (or if you can point me to some documentation) to implement a PDF whose parameters are function of the same variable it depends on, namely a function f(x,g(x)). Practically speaking I want to extract a lifetime by fitting the time distribution with a RooDecay PDF where the parameters of the RooGaussModel I use to parametrize the resolution depend on the time itself.

I’ve seen that this is easily done in the most general case of a function f(x,g(y)), but I couldn’t manage to make it working by naively setting y=x.

Thanks a lot in advance

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